- on HW, parts of this will still be used to support LVDS
- LVDS appears to have dissapeared before Turing, so this won't be
  needed at all when running on RM
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-31-skeggsb@gmail.com